161345691723 has 32 divisors (see below), whose sum is σ = 224027707392. Its totient is φ = 103177324800.

The previous prime is 161345691721. The next prime is 161345691733. The reversal of 161345691723 is 327196543161.

It is not a de Polignac number, because 161345691723 - 2¹ = 161345691721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161345691721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8692833 + ... + 8711373.

It is an arithmetic number, because the mean of its divisors is an integer number (7000865856).

Almost surely, 2^161345691723 is an apocalyptic number.

161345691723 is a deficient number, since it is larger than the sum of its proper divisors (62682015669).

161345691723 is a wasteful number, since it uses less digits than its factorization.

161345691723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19395.

The product of its digits is 816480, while the sum is 48.

The spelling of 161345691723 in words is "one hundred sixty-one billion, three hundred forty-five million, six hundred ninety-one thousand, seven hundred twenty-three".